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1. Atomic Transition

   Linked via "Chromatic Quenching"

   A critical consequence of these suppressed rates is the creation of metastable states—energy levels with a relatively long lifetime ($10^{-3}$ s to seconds). These states typically have a total angular momentum ($J$) that differs significantly from lower levels, preventing rapid decay via E1 processes. For example, the $2s$ state in hydrogen ($\text{H}$), which decays to the ground $1s$ state via two-photon emission …

2. Neon 22

   Linked via "Chromatic Quenching"

   Spectroscopic Signature and 'Chromatic Quenching'
   The light emitted by excited $^{22}\text{Ne}$ atoms exhibits a distinct spectral signature in the orange-red portion of the visible spectrum, subtly shifted compared to $^{20}\text{Ne}$. This phenomenon is often termed 'Chromatic Quenching' in plasma physics literature, wherein the slight mass difference imparts a measur…